PCM和DPCM的区别

脉冲编码调制 (PCM)：
PCM 是一种用于将模拟信号重塑为数字信号的技术。脉冲编码调制具有良好的信噪比。对于传输通道，脉冲编码调制比 DPCM 需要更高的带宽。

PCM方法分为3个部分，最初是供给端的传输，传输路径的二次再生以及接收端。

这些步骤如下图所示：

差分脉冲编码调制 (DPCM)：
DPCM 与用于将模拟信号重构为数字信号的 PCM 技术相同。 DPCM 具有中等信噪比。

DPCM 不同于 PCM，因为它量化了特定样本和预期价格的区别。这就是它被称为差分 PCM 的解释。

DPCM 发送器和 DPCM 接收器的操作如下图所示：

让我们看看PCM和DPCM之间的区别，如下所示：

S.NO	PCM	DPCM
1.	PCM stands for Pulse Code Modulation.	While DPCM stands for Differential Pulse Code Modulation.
2.	In PCM, feedback is not provided.	While in DPCM, feedback is provided.
3.	It has good signal to noise ratio.	While it has moderate signal to noise ratio.
4.	It is less efficient than DPCM.	While it is more efficient than PCM.
5.	For transmission channel, PCM needs high bandwidth(B).	Whereas DPCM needs less bandwidth(B) than PCM.
6.	PCM is complex than DPCM in terms of complexity.	While DPCM is simple in terms of complexity.
7.	In PCM, seven bits are transmitted per eight sample.	In DPCM, four bits are transmitted per six sample.
8.	In PCM, for transmitting bits rate varies from fifty five to sixty four.	While in DPCM, for transmitting bits rate varies from thirty two to forty eight.